CO2 high-concentration online dilution system and dilution method thereof

Abstract

The invention discloses a CO2 high-concentration online dilution system and a dilution method thereof. The online dilution system mainly comprises a zero gas cylinder, a pressure reducing valve, a mass flow meter, gas mixing modules, a low-flow-rate pump, a semi-permeable membrane adopting pipe, a profile system, a filter and an analyzer, the pressure reducing valve is connected with a three-way electromagnetic valve and divided into an upper pipeline and a lower pipeline, each pipeline is connected with a mass flow meter, each mass flow meter is sequentially connected with a two-way electromagnetic valve and the gas mixing module, a mass flow meter and a low-flow-rate pump are sequentially connected behind each gas mixing module, each low-flow-rate pump is connected with the first four interfaces of an eight-channel electromagnetic valve, the two gas mixing modules are connected with a two-position three-way electromagnetic valve, the two-position three-way electromagnetic valve is connected with the profile system, and the profile system is sequentially connected with the filter and a PICARRO analyzer through a pipeline. According to the invention, two groups of dilution systems are used in parallel, and when one group is used for measurement, the other group can be used for gas extraction and complementary measurement, so that the gas mixing time is prolonged, and the dilution speed is increased.

Description

technical field [0001] The invention belongs to CO 2 The field of processing technology, specifically related to a CO 2 High-concentration online dilution system and its dilution method. Background technique [0002] Soil is one of the largest and most active carbon pools in the earth's surface system. European and American countries have launched national comprehensive research projects to analyze the carbon sequestration potential of soil and the way to realize it, as a way to control and formulate CO 2 Emission Inventory and CO 2 The basis for emission reduction quotas, in-depth understanding of CO in soil 2 The emission characteristics of the Soil CO 2 The concentration is often as high as tens of thousands of ppm, far exceeding the range (4000ppm) of existing instruments. Therefore, it is necessary to pre-adjust CO 2 The gas is diluted in-line, the existing CO 2 The online dilution system has the following disadvantages: (1) the existing CO 2 The reaction speed...

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Problems solved by technology

Therefore, it is necessary to pre-adjust CO 2 The gas is diluted in-line, the existing CO 2 The online dilution system has the following disadvantages: (1) the existing CO 2 The reaction speed of the dilution system is slow; (2) CO 2 The efficiency of the gas dilution system is low. The dilution factor is manually set, and the dilution work is completed according to a fixed factor. After dilution, the gas concentration in the sample will be outside the range of the spectrometer, and it needs to be diluted again to complete the analysis work; (3) Existing CO 2 Insufficient mixing of the dilution system is not conducive to the subsequent dilution and reduces the dilution efficiency

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